Every El Nido tour brochure shows the cliffs, but few mention who lives inside them. The limestone walls of Bacuit Bay shelter birds, bats, insects and other cave specialists that depend on dark, quiet, undisturbed spaces. This guide focuses on cave wildlife specifically for respectful travelers, photographers and families who want to spot animals on a tour without stressing them. You will learn what you might see, how to behave near roosts, and how the caves connect to the bigger story told in our karst geology guide.
Why Caves Are Wildlife Hotspots
Caves offer stable temperatures, shelter from predators and protection from storms. In a hot tropical climate that stability is valuable: a roost inside a cliff can be several degrees cooler than the open air and far quieter. Animals that use caves range from permanent residents, which spend their whole life in the dark, to visitors that shelter or breed there only at certain times of year.
Because many cave animals raise their young in the same spot year after year, a single disturbance during breeding season can cause colonies to abandon a site. That is why guides and rangers in the El Nido-Taytay protected area ask visitors to keep voices down, avoid flash photography inside roost chambers, and never touch nests or enter closed-off areas. Review the protected area rules before you book.
Swiftlets: The Tiny Birds Behind the Sound
If you hear rapid clicking and chittering as your boat drifts near a cliff, you are probably hearing swiftlets. These small, dark, fast-flying birds nest on cave walls and overhangs. Many swiftlet species navigate in darkness using echolocation clicks, a trick more commonly associated with bats. Their nests are built from saliva that hardens into a cup shape, and in some parts of Southeast Asia those nests are harvested commercially as the ingredient for bird’s nest soup.
What matters for a visitor is simple: swiftlets are easily disturbed, they nest in colonies, and they are extremely small and quick, so binoculars beat a phone camera. Do not shine bright torches at nests, and do not bang paddles or clap to hear echoes. If you spot nests, look from a distance and move on quietly.
Bats: Night Shift Neighbors
Bats are the other major cave residents in northern Palawan. Depending on the species, they either roost in caves and crevices by day or hang in trees such as those along the mangrove edges. Insect-eating species help control mosquitoes, while fruit-eating species disperse seeds that regrow forest, so both are quietly valuable to the coastline you came to enjoy.
Dusk is the best time to watch. If you are staying near a cliff or in a hillside resort, step outside at sunset and look for silhouettes streaming out to feed. Never disturb a roosting colony, never handle a bat, and if you find a bat on the ground, tell a resort staff member or ranger rather than picking it up. As with any wild mammal, avoid contact with saliva and seek medical advice if you are scratched or bitten; our local safety guidance lists basic precautions for boat days.
Wildlife You Might Spot at Cave Mouths and Cliffs
The table below summarizes typical animals seen around limestone cliffs and caves in Bacuit Bay. Sightings depend on season, time of day and luck, so use it as a guide rather than a checklist.
| Animal | Where to look | Best time | How to behave |
|---|---|---|---|
| Swiftlets | Cave ceilings and cliff overhangs | Morning and late afternoon flight activity | Keep quiet, no bright lights, use binoculars |
| Bats | Deep crevices, cave interiors, nearby trees | Dusk emergence | Stay back, never handle, no flash |
| Cave crickets and other invertebrates | Cave walls near entrances | Any daytime visit | Do not touch surfaces, watch your step |
| Reef fish at cave mouths | Submerged rock near sea caves | Calm, clear-water days | Fins off the bottom, no feeding |
| Seabirds and sea eagles | Cliff tops and tall trees | Early morning | Keep boat distance, no drones |
| Monitor lizards | Shoreline rocks and beach edges | Warm midday | Give space, never feed |
How to Visit Caves Responsibly: A Simple How-To
- Choose a licensed operator. Reputable boats follow local group-size limits and know which caves are open.
- Check the tide and sea state. Some sea caves flood or become dangerous at high tide, and swells can push a boat into rock.
- Wear the right gear. Water shoes with grip, a life jacket, and a small headlamp with a red or low-power setting.
- Keep noise low. Speak softly, no music, no whistling, no echoes.
- Avoid flash and drones. Both disturb birds and bats. Read our drone photography rules first.
- Do not touch anything. Formations, nests and walls are fragile and often slippery.
- Take all trash out. Even a single wrapper can attract pests into a cave.
These habits also protect you. Cave floors can be wet and uneven, ceilings can be low, and guano piles, though natural, can release dust and fungal spores that are best avoided in enclosed spaces. If you have breathing problems, skip deep cave interiors.
Cave Wildlife and Human History
Caves in Palawan have long been used by people as well as animals. Archaeological work elsewhere on the island has found ancient burial and habitation sites in limestone caves, and our Ille Cave and Dewil Valley guide covers the local side of that story. When you visit a cave that has both cultural and ecological value, treat it like a museum and a nature reserve at once: look carefully, leave nothing behind and follow your guide’s instructions.
For broader conservation context, the Philippine Department of Environment and Natural Resources and the IUCN publish information on protected species and habitats, and the Department of Tourism lists national visitor guidelines. Coral-friendly practice at cave mouths is covered in our coral conservation guide.
What to Pack for a Cave-Friendly Tour Day
Pack light: a dry bag, water shoes, compact binoculars, a small headlamp, reef-safe sunscreen and a hat. Bring a lightweight long-sleeve rash guard, since limestone edges scratch and the sun reflects strongly off pale rock. Add a zip pouch for trash, a small first-aid kit for scrapes, and a phone pouch to keep electronics dry.
Best Times of Day
Early morning offers calmer seas, fewer boats and the most bird activity. Late afternoon can be atmospheric but tides and winds may complicate landings. If a wildlife moment is the priority, ask the boat crew to arrive at cave sites before the crowd.
Traveling With Kids
Explain the rules before you land: quiet voices, no touching, no chasing animals. Children who understand why the rules exist tend to follow them, and many enjoy playing spotter for birds and lizards. Keep a firm hand on little ones near slippery ledges, and make sure each child wears a properly fitted life jacket at all times on the boat.
Photography Tips
Use a fast lens or higher ISO instead of flash, brace your elbows against the boat rail, and shoot from a distance. A modest zoom lets you capture wildlife without crowding it, which is better for the animals and usually better for the picture.
Seasonal Notes for Wildlife Watching
Birds and bats respond to seasons just as people do. The drier months from roughly December to May bring calmer seas and easier landings, which makes cave-mouth visits more comfortable, though breeding activity varies by species and year. During the wetter months, rain and swell can make caves inaccessible and cliff scrambling risky. Instead of chasing a specific sighting, ask your boatman what he has seen recently and stay flexible about the route.
Why Your Behavior Matters More Than You Think
A single tour boat may carry only a dozen people, but El Nido receives thousands of visitors each week in busy periods. If every group lingers, talks loudly, and shines lights into a nesting cavity, the cumulative effect is heavy. Colonies that abandon a site rarely return quickly, and the loss of birds and bats also means fewer insects eaten and fewer seeds spread. Responsible visitors are, in a very practical sense, part of the conservation system.
Supporting Local Guardians
Rangers, boatmen and community guides are the first line of protection. Pay entrance and environmental fees without complaint, choose operators that respect quiet zones, and consider a small tip when a guide goes out of their way to show you wildlife safely. If you witness harassment of animals, such as people throwing rocks, chasing birds or removing nests, report it politely to your operator or the local tourism office rather than confronting anyone directly.
A Note on Cave Safety Basics
Before entering any cave, tell your guide or boat crew where you are going and how long you expect to be inside. Check that everyone in your group has a working light, appropriate footwear and a clear idea of the way out. Never enter alone, never split the group, and turn back if the water level rises, if the swell picks up, or if anyone feels unwell. Sea caves can change quickly with the tide, so a comfortable entrance at mid-morning may become impassable an hour later. Respect closures and warning signs even when other tourists ignore them, because the local knowledge behind those rules usually comes from a past accident or a real ecological concern.
Frequently Asked Questions
Can I see bats in El Nido during the day?
Sometimes you can see them roosting inside crevices or cave mouths, but you should observe from a distance and never disturb them. Dusk is the best time to watch them fly out.
Are the birds in the caves swiftlets?
Many are likely swiftlets, small fast-flying birds that nest on cave walls. A local guide can confirm what you are hearing or seeing.
Is it safe to enter caves in El Nido?
Some are safe with a guide and good conditions, but tide, swell and slippery rock make others hazardous. Follow your boatman and skip closed areas.
Is flash photography allowed in caves?
It is best avoided. Flash can startle roosting birds and bats, so use higher ISO and steady your camera instead.
Should I touch stalactites or nests?
No. Touching damages fragile formations, and disturbing nests can cause birds to abandon them.
